Spirometry Predicted Values — Bayu Healthcare
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Respiratory Care
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Spirometry Reference · Indian adults

Predicted lung function, the right way for Indians

Enter age, sex and height to get predicted FEV1, FVC and FEV1/FVC with each person's own lower limit of normal — using north Indian reference equations, not Caucasian or GLI values that over-call disease in Indian patients. Add measured values to read the pattern.

cm
kg
Measured values — optional

Add the patient's recorded FEV1 and FVC to get % predicted, z-scores and the ATS/ERS pattern.

L
L
Result

Enter the details and predicted values will appear here.

ParameterPredictedLLNMeasured% predz

An educational reference, not a diagnosis. This tool computes predicted values and lower limits of normal; it does not diagnose disease. Spirometry must be performed to ATS/ERS acceptability and repeatability standards, and every result interpreted by a qualified physician alongside the clinical picture. A "restrictive pattern" on spirometry is only suggestive — confirmation needs lung volumes (TLC). Reversibility and bronchodilator response are outside this tool's scope.

Why Indian equations? Validation studies show GLI-2012 and Caucasian equations systematically over-diagnose restriction in Indian patients; applying correction factors to foreign equations is discouraged. These north Indian equations suit adults from Delhi, Punjab, Haryana and Uttar Pradesh; south/east/west Indian regional equations differ. Validity range: age 18–71 (men) / 18–65 (women); height 150–193 cm (men) / 141–170 cm (women). Values outside these ranges are extrapolations.

Equations: Chhabra SK et al. Indian J Chest Dis Allied Sci 2014;56:221–229 (ICMR multicentric study) Interpretation: ATS/ERS standards
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